I had a similar issue with my LATE 2013 rMBP going from 10.15 to 11.0b2, except the progress bar was 3/4 full and wouldn’t go any further. The solution appears to have been hard power off, doing an SMC reset, followed by a PRAM reset. Now, the progress bar says there’s about 8 minutes remaining. I’ll update in a few if it actually finishes, but it looks good!
tthoma24
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